Heating apparatus



A. J. LA FAY.

HEATING APPARATUS. APPLlfiATION FILED ocr. 25. I919.

Patented Aug. 17, 1920.

ZNVENTUR UNITED" ES PA QFFLCEQJ:

' Art'rirrm mar er FAY. or rcnonro, cures-r0, caimnn.

HEATING APPARATUS. I

1 349 1*? M specification of LettcrsPr-ltcnt.

Toolbar/20m it only concern 5 IBeit known tli:tt l. ,An'rn. In, .losarl LA F Y, a resident oftl e city ol joionto in the county of ,York; dfcoyince oi; .Qntarro Can ada, havainvcnted certainyr ew and useful Improvements in. rl-feat ng. A'pparatuslpf tween the furnace walls or cas ngzand an outer easing into longitudinal fines, dampers being provided to permitofilirect draft Whene rde sd-i Inmyco-pending application No. 284962 filed Mafrch 25tl1 l-9l9, the invention was appliedto a horizontal furnace with vertical sections. Iuthe presentinvention 1 illustrate the device as applied to an .ordi nary vertical horiaontahseotion hot water and steam boiler.

The apparatus 'isconstructcd in (lc ail as hereinafter more specifically desrrihwl and as illustrated in the accompanying drawings in which Figure 1 is a front elevation showing a vertical furnace provided with my improve ments;

Fig. 2 a side elevation of the same, partly in section; and

Fig. 3 a horizontal section on the line a-b in Fig. 2.

In the drawings like numerals of reference indicate corresponding parts in the different figures.

1 is a vertical hot Water or steam boiler of any ordinary sectional type, though the invention is. of course, applicable to other constructions of vertical furnace.

In this furnace 2 is the smoke exit and 3 the furnace casing. The furnace is surrounded by an external casing 4 which is preferably made of some suitable heat insulating material or of metal lined with such material. and which is made completely air tight. This casing is so arranged that the front of the furnace, with the fuel, ashlatontcd Aug. 1 7. 1920.

Ap pliqationifiledpoctober 1919, Serial no. {manta I pit and clean-out doors, is exposed as shown particularly in Fig.4. 1 and This casing extends ahoyc the top of the furnaco as shoivn more pa ticu la'rly in; The spare between t external :casing is diyidcd. ntoa .lurality 6f nsi in l.wrr n lr'atins 1 e by means of plnrality of baffles 5 I-nthe preferred arrangement three such bafhes are shown at each side of the "urnace, Passages for the products ofcoxhbustion are formed alternately at opposite ends of those baffles as shown. The products of colnhus tion from the smoke exit 2 are prevented from passingdirectly tothesinoke outlet 6 loading from theouter casing by means of the horizontalv baffles 7 at the top of the fur naceand tyeawalls of the flue 8. w hic;hcxtendhetween the top of the f;urnaric c asing and the .top of the gexte rnalcasing, I thi i he ted e ashes: 9- 'Wlwn. h as slioyvii inFigs 2 and 3.

damperis closed the prodnotsof combustion must pass doiyn the longitudinal flues atpachisidedof the furnace at the fron tlie'nce through each of the other longitu' in al flues in the series until they reach the longitudi al fine at the hack withwhich the smoke outlet (3 directly communicates., I y

The smoke outlet 6 maybe ider at the top or the sideas indicated Fig. 2.

ln (use it is found that it is not dcsirahle to give the hot products of combustion such a long course over the external surface of the furnace casing, I provide a damper 10 in the front baffle 5 at each side. When these dampers are open the products of combustion may pass at each side directly to the next to last longitudinal flue toward the back of the furnace, thence down this fine and up the flue immediately at the back of the smoke outlet. When the damper 9 is thrown down to the horizontal position, the products of combustion from the smoke exit 2 may pass directly to the smoke outlet 6 giving the benefit of direct draft when the fire is being, started or at such other times as very strong draft is needed.

Clean-out doors ll are provided in the external casing Wherever needed.

I find that there are certain advantages in. introducing heated air into the products of combustion under certain conditions. therefore pIOVltlO the pipes 12 which are led to the space between the two casings near the front and are carried up to the urna p a e a th i v top where the air is discharged to miir with the products of coml'iustion. The lowerend of each pipe may be pnwided with a 0.1mtrolling, valve. The water connections of the heater are shown at 'l4ll5, but of course any ordinary arrangement may be adapted.

As a matter of fact, the external casing and batlies may be applied to any type of vertical boiler, the details being varied according to the specific constrnetimi of the furnace.

I find that with the construction shown I am enabled to secure greatly increased efficiency in the operatioh of the furnace for heating fluids while maintaining under all circumstances an adequate drait.

I claim as my invention is 1. e contb'ina'tidn with a fluid heating furnace of the vertical type provided with internai .flue s 'for the products of comhustion and spaces for the fluid to be heated externally bounded by the casing 01 the furnace and surrounding the internal flues, fuel and 'ashpit doors at one side and a sin gle smoke exit in the top, of an external casing iaoed from the sides of theorising but leaving the front of the casing with the fuel and ashp'it doors exposed; a. smoke outleft the top of the external casing; dqpend n hatlles, one at .each side of the tiurnaee, 'ivrdin gi the sfp'ace between the easi into a plura ity 0 vertical fines; verticii Walls, extending between the top of the furnace casin and the to of the external casing, and rom the si es of the smoke exit off the furnace to the wall of the said casing, said Walls forming a flue, the smoke exit of the furnace, the smoke outlet of the external casing and the space between the two casings all comnnmicating with said fine; a damper in said flueadapted to cut off direct communication between. the said smoke-cult -& rthfl Saidgmoke outlet; and horizontal be es adapted to direct products of mamhuetion from the smoke exit to the space between the two casings at the side of=the -vertical bafiies remote from thesmoke outlet of the external casing.

2. mile eotntfi'rratti'on with a fluid heating furnace of the vertical type provided with internal fines for the products of eonibus tion and spaces for the fluid to be heated externally bounded by the "easing of the furnace and surrounding the lIltGIllad f'l 'ues, fuel and ash'pit deo'rsat one side and a smoke exit at the :tovp elf an external casing spaced from thesides of the casing; a sm ke outlet at the top of *the'external casing; a lura lity of baflles dividing the 's pace at eac side of the furnace between the casings into *two or more vertical. fines; means for causing the products of eoml'iustion to 'pass through a 1'i'lu'ral-i'ty of said Flues on their way to the smoke outlet or su'hs't-antiaslly directly to said outlet; and dampers whereby the extent of travel of the products of combustion through the vertical fl ues may be varied.

8. A fluid heating furnace constructed as set forth in claim 1 prevkhad with other vertical loalil' es further dividing 'the space between the casings and dampers into two or more vertical fl-ues'; means for causing the products of combustion to ass t'hrou h a plurality of said fines on til-1 r way to tie smoke outlet or su-hstantial ly directly to said outlet; and dampers whereby the ex tent of travel of the products of combustion through the vertical flues may be varied.

Signed at f-oronto this 17th day of (Dot,

ARTI'I UTR 5. LA *FAY. 

